1) 5^5x+1,5=25

2) 6^6x-9=219

3) 2^8-13x=1//32

4) 7^1,2x+0,6=1//343

5) 10^21-6x=0,001

1) 5^ (5x - 1,5) = 5^2;

5x - 1,5 = 2;

5x = 3,5;

x = 0,7.

2) 6^ (6x - 9) = 216;

6^ (6x - 9) = 6^3;

6x - 9 = 3;

6x = 12;

x = 2.

3) 2^ (8 - 13 x) = (1/2) ^5;

2^ (8 - 13 x) = 2^ (-5);

8 - 13 x = - 5;

- 13 x = - 13;

x = 1.

4) 7^ (1,2 x + 0,7) = 7^ (-3);

1,2 x + 0,6 = - 3;

1,2 x = - 3,6;

x = 3.

5) 10^ (21 - 6x) = 10^ (-3);

21 - 6x = - 3;

- 6x = - 24;

x = 4.